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Re: svn commit: r27097 - trunk/subversion/libsvn_fs_fs

From: David Glasser <glasser_at_davidglasser.net>
Date: 2007-11-07 01:09:11 CET

On 10/11/07, Malcolm Rowe <malcolm-svn-dev@farside.org.uk> wrote:
> On Wed, Oct 10, 2007 at 04:02:37PM -0700, glasser@tigris.org wrote:
> > Move the cache of *immutable* DAG noderevs from revision roots to the
> > svn_fs_t object. This extends the lifetime of cache entries; in my
> > test, a somewhat large diff operation on a repository in NFS got a 4x
> > speedup. Transaction DAG noderevs are still in the roots (though
> > perhaps this should change).
> >
> Nice change! Is it worth considering whether this cache can go into the
> per-filesystem object (fs_fs_shared_data_t) instead of the
> per-filesystem-handle object (fs_fs_data_t)?
> Obviously you'd have to add some locking, but it would help to ensure
> that we can still benefit from the cache when we open a new handle.

That would work, but as you mentioned would require mutex overhead for
threaded builds; one would need to benchmark multithreaded servers to
see if it ends up being a win or a loss.


David Glasser | glasser_at_davidglasser.net | http://www.davidglasser.net/
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Received on Wed Nov 7 01:09:25 2007

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